evergreen wood fern vs woodfern

evergreen wood fern and woodfern both are nouns.

Word	Noun	Adjective	Verb	Adverb
evergreen wood fern	Yes	No	No	No
woodfern	Yes	No	No	No

As nouns, woodfern is a hypernym of evergreen wood fern; that is, woodfern is a word with a broader meaning than evergreen wood fern:

Other hypernyms of evergreen wood fern include wood-fern, wood fern.

evergreen wood fern (noun)	woodfern (noun)
North American fern with evergreen fronds	any of various ferns of the genus Dryopteris
North American evergreen fern having pinnate leaves and dense clusters of lance-shaped fronds